We got better at finding people who didn't want to be found. It was by reviewing state filings from Topeka, Kans. in the late 1980s about privately held Koch Industries that a researcher discovered a 16% stake belonging to a then-unknown Houstonian named J. Howard Marshall II. After making the rich list in 1989, he later became even more famous as the 90-year-old husband of flamboyant model Anna Nicole Smith.

We probably still haven't uncovered every last American who ought to be included, but they're finding it harder to hide.

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